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I bought an old pressure cooker, it's a presto and there's a box with a seal and something else for model(s) 620, and up. I have no idea how to put the rubber ring on because it seems to not fit or something. GAH! Anyone have one of these things?

I've got a 'beautiful' Harvest Gold Presto PC. It's mondo simple to use. It used to be my mom's. I read the manual a while ago and haven't looked at it since. Yeah, not even after looking for it! I did get a new set of seals a while ago- a new main O-ring and something for the relief valve (can't really remember that part). Both where easy to install. The O-ring fit just inside the lip of the lid. The relief valve was apparently so simple that I can't remember how it went.

You might want to try a Google search to see if it really is a '620', for what ever that's worth. Manuals seem to be hard to find online. However, I did find this <http://www.gopresto.com/downloads/instructions/72453_01_canner.pdf???.pdf>(yeah, so I haven't figured how to do links on Shoomery yet). It's pretty similar to mine (the 70's Harvest Gold PC), except that mine 1) has a nifty lid that only goes on a certain way and then locks into place (apparently was replaced by a 'locking bracket') and 2) has one 'emergency valve' instead of the 'overpressure plug' and 'air vent'.

Of course, if it came in a box with a set of seals, it probably came with a set of instructions... And maybe some print on the outside saying just what model it was?

Reading a manual would be a realllllly good idea, since there is a chance you could blow the bugger (and you!) up.